Composite rubber heel.



W. EIMACKENNA. COMPOSITE RUBBER HEEL,

APPLICATION FILED IIAY5I 1917.

g, Patented Apr. 16, 19m

lpg/ 1 f'fy- 4 4 TTURNEYS fing sides 14 of a, plate 15 'permanent heel 11 of the shoe rn rare rarnnr orio WELAM EDMUND MACKENNA, 0F BROOKLYN', .NEW YGRK.

comrosrn RUBBER nner Specification of Letters Patent.

rammen apr. ie, reis..

Application filed May 5, 1917. Serial No. 166,515.

vide a rubber heel in which Athe air cushionA is substantially immune to puncture.

A still further object of the invention is to provide a rubber heel which Will present a bulging, yielding wearing surface.

I attain the above and other objects of my invention by the structure conventionally disclosed in .the accompanying drawings, wherein similar characters of references indicate corresponding parts in all the views.

Figure 1 is a fragmentary side elevation of a shoe provided with a heel embodying my invention;

Fig. 2 is a longitudinal cross section through the heel of the shoe;

Fig. 3 is atransverse section on line 3 3,

F ig 5 is a longitudinal section on line f 55, Fig 4; and

Fig 6 is a perspective view/ of the comfosite heel on the plate whereby it may b/e etachably secured; to the p/ermanent heel section of the shoe.

The composite heel 7 has /a hardenedrub ber border 8 and" a liexible/ or yielding central section 9 which is provided on the inner face of the heel with a spongy-rubber pad 10, the upper surface of which is convex and which bulges mostly near the rear end of the heel 7. This pad 10 may be formed on the heel or cemented thereto.

The composite heel may be secured to the by any suitable means, but preferably the inner face of the composite heel is provided with a recess 12 tapering rearwardly, the sides 13 of- Which are undercut to engage the raised, flar- Which has a taper pad'willr force the yielding,

similar to the taper of the recess 12. The plate is anchored to the permanent heel 11 of the shoe by prongs 16 raised from the bottom of the plate. lThe rear end of the plate and the reary end of the recess 12 are preferably rounded to conform to the rounded rear of the heel. The sides 13 of the recess are preferably formed within the border 8 to make the said sides of the recess unyielding to better grip thesides of the plate.

When the heel 'is recessed the pad 10 rises from the recess above the inner face'of the composite heel, consequently it will be compressed When the omposite heel is forced on to the plate 15. lhe compression of' the central part of the heel 'to bulge out, thereby presenting a bulging' wearing surface, the most .of the bulge being nbr the rear of the heel, due to the fact that the lpad, originally bulged most near the rear of the composite heel.

The other end of the plate 15 has a lip 17 which comes in contact with the front of the heel and forms an additional stop for the composite heel on the plate, the other stop being formed by the rounded ends of the plate and recess. Preferably au aperture 18 is provided in the plate 15 throughA which a nail or screw 19 may pass from the composite heel to the permanent heel 11 of the shoe.\

As previously pointed out th/e ybulging of the Wearing surface is at the ,rear of the heel and, therefore, at the most advantageous point to relieve the impact caused by Walking, as the first point of the shoe coming Ain contact with the ground is the rear part of the heel. The presence of the spongy rubber between the permanent and composite heel presents an air cushion, which adds to the eciency rubber section and the rubber present in the spongy pad. The air cushion of the spongy rubber in the ad is formed by the air in-v closed in the ce s of the spongy rubber and, in consequence, the air chamber is substantially immune to puncture, for if some of the cells in the spongy rubber are punctured of the yielding 'l the efficiency of the other cells will not be impaired. By placin the spongy rubber on the inner surface of t `e composite heel it is protected by the exible setion 9 from puncture and also from Wear. continuously forces the flexible section 9 out Wardlv. for as the said section wears Iit@ Further, it

lzo

-the scope of the eppenflecleleims.,

, li claim:

1. A composite rubber heel nevmg e yielding rubber section end :i multieelluler section bulging the' rubber section l erm Werdly.

2. A composite rulnoer neel lie/131g e ber *pecl on the inner sureee 01"' the yielding 'section bulging J@lie outer surface ei" he rubber section, l

3. A composite rubber lieel having e. yield ing rubber section and e bulging jspeielgy rubper pad on the inner fece @if the yielding section, the highest point of seid bulging p ecl being nea-1' Jelle rear of the yielding eee edepted te eng-ege. y -f tlon.

yielding section bordered by e rigid. seeieii, end.` e multieelliilar eir eusliien en the imei" face of the yielding seeiere 5. A composite rubber lieel lieiiig e yielding portion, rigid petien bordering@ tlieyielduig portion, end. e Emengy rubber pad ori4 the' inner feceeiz the yieldingi pee# tion. 6. A composite rubber heel heyiiig e' yielding portion ende rigid portion herder igng the yieldmggportlen, e recess m the eemposite heel, the sides er Wliieli recess ere formed in. the rigid pertieigseixi reeess tapering rearwardly enel having -imcleieuiz sides, e, spongy rubber perl iniliereeess bulging ebeve lie fece eri the yieleliiig tion nearer' `she ieer ef @he lie-el e elr cushion on the inner ieee ei' the yielding Il. A. eompesige rubber heel e eumiefxe eree the lmilgiiig portion oi' lie peri below l i the imiei' suivieee of the ieel lwhereby alie wearing smeee' ei the heel is birilgecl eut, seid. elee having means whereby the seme may of e shoe y i1 A composite rulober lxeel leaving e yielding section bordered by a rigid. section, seid lieel heyiig means en the inner sureee whereby it may be seeuieol emi e emiltieelluler aie cushion en elle iimer fece. ef the heel eflepiefi sehe compressed against seid imier` 'ieee seid lieel is secured, whereby the 'yielding section of the -lieel is ceusefl te buleeuij, en the Weerig surface subsi-en# fielly emi for the purpose seiJ ziorih.

8, eempeeie rubber heel having e yielding section, seid heel hei/mg' means en.

the imei' ieee whereby .the heel ine-y loe' eeeured, .and :i bulging, spengy-ruleber paid en the yielding section normally projecting eleeye the inner fece of the heel, seid paci.

being adapted to ee depresseel below seid inner' surface when Ene heelV is secured.,

whereby die wearing surface of the yielding.

seefbioii is caused te bulge. v

9. lin combination Wih. e shoe heel, e

metel plete Asecured ihere and presenting euetweilly-lerimg sides' which converge te- Wercl rem' e3? the iieela e eempeeie rubber 'lieviiige yielding seeiieii lnerderefl by e -ifiwfl seetiee, seiclleempeeite lieel lamine; e,

EL.. fee-e535; mi the `meer fece thereof ine sides of Winch we uner cui, ye futtlie sides of the pleteysexi recess eenvergmg rearwardly in e meneer similar te the plete, end e' multieelluleli' eir ees/hice in the rese 01E the eempdsite' heel, seid. cushion normally loulg vieg; ebay the immer ieee of' elle eompesite `heel9 whereby-'seid eushiemjis eompreesed; Wlieiejseideenipesite heel see/tien is @ei/eel en; ile elle plaie? the com ressien of Seidl eir cushion eeusi'n yelle le ging ef elle Wearing eig thefyielclieg/seetiee ef ille `eemee 'y filiillDli/HED lMleellEliNA e semi-eel to e permei'ien; heel seeioii- 

